852T: Problem getting traffic out FEC interface using vlan

[Keith Redfern]

The system that I am using is as follows.....



Embedded Linux on a Motorola 852T processor with FEC support. Embedded

Planet BSP



Software that runs on the embedded processor to send UDP packets, via

the FEC port (eth1), to a PC. 



This PC is directly linked to the FEC port with a cable and is running

etherpeek.



Software that runs on the embedded processor to listen to all received

traffic at the FEC (uses RAW packet socket).



802.1q Support has been enabled in the kernel. 802.1Q VLAN Support v1.8

Ben Greear <greearb at candelatech.com>



 



The vlan configuration that I am applying is ......



> ifconfig eth1 down



> ifconfig eth1 0.0.0.0 up



> vconfig add eth1 2



> ifconfig eth1.2 192.168.2.2 up



 



After this is done ifconfig returns the following .....



# ifconfig



 



eth0      Link encap:Ethernet  HWaddr 00:10:EC:00:52:FC



          inet addr:10.226.210.86  Bcast:10.255.255.255  Mask:255.0.0.0



          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



          RX packets:210599 errors:0 dropped:0 overruns:0 frame:0



          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0



          collisions:0 txqueuelen:100



          RX bytes:20804624 (19.8 MiB)  TX bytes:0 (0.0 B)



          Base address:0x3e00



 





eth1      Link encap:Ethernet  HWaddr 00:10:EC:80:52:FC



          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



          RX packets:64 errors:0 dropped:0 overruns:0 frame:0



          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0



          collisions:0 txqueuelen:100



          RX bytes:9055 (8.8 KiB)  TX bytes:365 (365.0 B)



          Base address:0xe00



 





eth1.2    Link encap:Ethernet  HWaddr 00:10:EC:80:52:FC



          inet addr:192.168.2.2  Bcast:192.168.2.255  Mask:255.255.255.0



          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



          RX packets:0 errors:0 dropped:0 overruns:0 frame:0



          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0



          collisions:0 txqueuelen:0



          RX bytes:0 (0.0 B)  TX bytes:276 (276.0 B)



 





lo        Link encap:Local Loopback



          inet addr:127.0.0.1  Mask:255.0.0.0



          UP LOOPBACK RUNNING  MTU:16436  Metric:1



          RX packets:2 errors:0 dropped:0 overruns:0 frame:0



          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0



          collisions:0 txqueuelen:0



          RX bytes:122 (122.0 B)  TX bytes:122 (122.0 B)



 



Running the raw packet analyzing program in the background (dumps bytes

to screen) and then invoking the UDP send program (INET, SOCK_DGRAM

socket) to send UDP packets to the pc running etherpeek, I see the

following ........



 



# udpSend 192.168.2.1 jjjj



udpSend: sending data to '192.168.2.1' (IP : 192.168.2.1)



 





# ff ff ff ff ff ff 00 10 ec 80



52 fc 08 06 00 01 08 00 06 04



00 01 00 10 ec 80 52 fc c0 a8



02 02 00 00 00 00 00 00 c0 a8



02 01



Waiting for packets



Pkt Received of length 46:



 





ff ff ff ff ff ff 00 10 ec 80



52 fc 81 00 00 02 08 06 00 01



08 00 06 04 00 01 00 10 ec 80



52 fc c0 a8 02 02 00 00 00 00



00 00 c0 a8 02 01



Waiting for packets



 





ff ff ff ff ff ff 00 10 ec 80



52 fc 08 06 00 01 08 00 06 04



00 01 00 10 ec 80 52 fc c0 a8



02 02 00 00 00 00 00 00 c0 a8



02 01



Waiting for packets



Pkt Received of length 46:



 



ff ff ff ff ff ff 00 10 ec 80



52 fc 81 00 00 02 08 06 00 01



08 00 06 04 00 01 00 10 ec 80



52 fc c0 a8 02 02 00 00 00 00



00 00 c0 a8 02 01



Waiting for packets



 





ff ff ff ff ff ff 00 10 ec 80



52 fc 08 06 00 01 08 00 06 04



00 01 00 10 ec 80 52 fc c0 a8



02 02 00 00 00 00 00 00 c0 a8



02 01



Waiting for packets



Pkt Received of length 46:



 





ff ff ff ff ff ff 00 10 ec 80



52 fc 81 00 00 02 08 06 00 01



08 00 06 04 00 01 00 10 ec 80



52 fc c0 a8 02 02 00 00 00 00



00 00 c0 a8 02 01



Waiting for packets



 



Etherpeek doesn't show any info being received and the raw packet

analyzing program shows that the ARP and Vlan tagged ARP packets are

being seen on the receive side of the raw socket.



The stats show that info is being transmitted out eth1.2 and the lo

stats increase in the rx and tx counts. The eth1 stats stay constant.

The counts you see in eth1 are from being previously configured and

sending/receiving data.



 



I expect VLAN tagged ARP packets to be seen at etherpeek but understand

that the UDP packet will not be seen as the pc interface has not setup

to be vlan tagged. Can anyone shed some light on what is going on here?

Are there problems with my vconfig/ifconfig settings? Are there hardware

problems that mean this can't be done?



 



......... Keith R



 





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